netdev: network device operations infrastructure
This patch changes the network device internal API to move adminstrative
operations out of the network device structure and into a separate structure.
This patch involves some hackery to maintain compatablity between the
new and old model, so all 300+ drivers don't have to be changed at once.
For drivers that aren't converted yet, the netdevice_ops virt function list
still resides in the net_device structure. For old protocols, the new
net_device_ops are copied out to the old net_device pointers.
After the transistion is completed the nag message can be changed to
an WARN_ON, and the compatiablity code can be made configurable.
Some function pointers aren't moved:
* destructor can't be in net_device_ops because
it may need to be referenced after the module is unloaded.
* neighbor setup is manipulated in a couple of places that need special
consideration
* hard_start_xmit is in the fast path for transmit.
Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/dev.c b/net/core/dev.c
index e08c0fc..ca14ab4 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -1059,6 +1059,7 @@
*/
int dev_open(struct net_device *dev)
{
+ const struct net_device_ops *ops = dev->netdev_ops;
int ret = 0;
ASSERT_RTNL();
@@ -1081,11 +1082,11 @@
*/
set_bit(__LINK_STATE_START, &dev->state);
- if (dev->validate_addr)
- ret = dev->validate_addr(dev);
+ if (ops->ndo_validate_addr)
+ ret = ops->ndo_validate_addr(dev);
- if (!ret && dev->open)
- ret = dev->open(dev);
+ if (!ret && ops->ndo_open)
+ ret = ops->ndo_open(dev);
/*
* If it went open OK then:
@@ -1129,6 +1130,7 @@
*/
int dev_close(struct net_device *dev)
{
+ const struct net_device_ops *ops = dev->netdev_ops;
ASSERT_RTNL();
might_sleep();
@@ -1161,8 +1163,8 @@
* We allow it to be called even after a DETACH hot-plug
* event.
*/
- if (dev->stop)
- dev->stop(dev);
+ if (ops->ndo_stop)
+ ops->ndo_stop(dev);
/*
* Device is now down.
@@ -2930,8 +2932,10 @@
static void dev_change_rx_flags(struct net_device *dev, int flags)
{
- if (dev->flags & IFF_UP && dev->change_rx_flags)
- dev->change_rx_flags(dev, flags);
+ const struct net_device_ops *ops = dev->netdev_ops;
+
+ if ((dev->flags & IFF_UP) && ops->ndo_change_rx_flags)
+ ops->ndo_change_rx_flags(dev, flags);
}
static int __dev_set_promiscuity(struct net_device *dev, int inc)
@@ -3051,6 +3055,8 @@
*/
void __dev_set_rx_mode(struct net_device *dev)
{
+ const struct net_device_ops *ops = dev->netdev_ops;
+
/* dev_open will call this function so the list will stay sane. */
if (!(dev->flags&IFF_UP))
return;
@@ -3058,8 +3064,8 @@
if (!netif_device_present(dev))
return;
- if (dev->set_rx_mode)
- dev->set_rx_mode(dev);
+ if (ops->ndo_set_rx_mode)
+ ops->ndo_set_rx_mode(dev);
else {
/* Unicast addresses changes may only happen under the rtnl,
* therefore calling __dev_set_promiscuity here is safe.
@@ -3072,8 +3078,8 @@
dev->uc_promisc = 0;
}
- if (dev->set_multicast_list)
- dev->set_multicast_list(dev);
+ if (ops->ndo_set_multicast_list)
+ ops->ndo_set_multicast_list(dev);
}
}
@@ -3432,6 +3438,7 @@
*/
int dev_set_mtu(struct net_device *dev, int new_mtu)
{
+ const struct net_device_ops *ops = dev->netdev_ops;
int err;
if (new_mtu == dev->mtu)
@@ -3445,10 +3452,11 @@
return -ENODEV;
err = 0;
- if (dev->change_mtu)
- err = dev->change_mtu(dev, new_mtu);
+ if (ops->ndo_change_mtu)
+ err = ops->ndo_change_mtu(dev, new_mtu);
else
dev->mtu = new_mtu;
+
if (!err && dev->flags & IFF_UP)
call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
return err;
@@ -3463,15 +3471,16 @@
*/
int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
{
+ const struct net_device_ops *ops = dev->netdev_ops;
int err;
- if (!dev->set_mac_address)
+ if (!ops->ndo_set_mac_address)
return -EOPNOTSUPP;
if (sa->sa_family != dev->type)
return -EINVAL;
if (!netif_device_present(dev))
return -ENODEV;
- err = dev->set_mac_address(dev, sa);
+ err = ops->ndo_set_mac_address(dev, sa);
if (!err)
call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
return err;
@@ -3551,6 +3560,7 @@
{
int err;
struct net_device *dev = __dev_get_by_name(net, ifr->ifr_name);
+ const struct net_device_ops *ops = dev->netdev_ops;
if (!dev)
return -ENODEV;
@@ -3578,15 +3588,15 @@
return 0;
case SIOCSIFMAP:
- if (dev->set_config) {
+ if (ops->ndo_set_config) {
if (!netif_device_present(dev))
return -ENODEV;
- return dev->set_config(dev, &ifr->ifr_map);
+ return ops->ndo_set_config(dev, &ifr->ifr_map);
}
return -EOPNOTSUPP;
case SIOCADDMULTI:
- if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
+ if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
return -EINVAL;
if (!netif_device_present(dev))
@@ -3595,7 +3605,7 @@
dev->addr_len, 1);
case SIOCDELMULTI:
- if ((!dev->set_multicast_list && !dev->set_rx_mode) ||
+ if ((!ops->ndo_set_multicast_list && !ops->ndo_set_rx_mode) ||
ifr->ifr_hwaddr.sa_family != AF_UNSPEC)
return -EINVAL;
if (!netif_device_present(dev))
@@ -3633,10 +3643,9 @@
cmd == SIOCBRDELIF ||
cmd == SIOCWANDEV) {
err = -EOPNOTSUPP;
- if (dev->do_ioctl) {
+ if (ops->ndo_do_ioctl) {
if (netif_device_present(dev))
- err = dev->do_ioctl(dev, ifr,
- cmd);
+ err = ops->ndo_do_ioctl(dev, ifr, cmd);
else
err = -ENODEV;
}
@@ -3897,8 +3906,8 @@
*/
dev_addr_discard(dev);
- if (dev->uninit)
- dev->uninit(dev);
+ if (dev->netdev_ops->ndo_uninit)
+ dev->netdev_ops->ndo_uninit(dev);
/* Notifier chain MUST detach us from master device. */
WARN_ON(dev->master);
@@ -3988,7 +3997,7 @@
struct hlist_head *head;
struct hlist_node *p;
int ret;
- struct net *net;
+ struct net *net = dev_net(dev);
BUG_ON(dev_boot_phase);
ASSERT_RTNL();
@@ -3997,8 +4006,7 @@
/* When net_device's are persistent, this will be fatal. */
BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
- BUG_ON(!dev_net(dev));
- net = dev_net(dev);
+ BUG_ON(!net);
spin_lock_init(&dev->addr_list_lock);
netdev_set_addr_lockdep_class(dev);
@@ -4006,9 +4014,46 @@
dev->iflink = -1;
+#ifdef CONFIG_COMPAT_NET_DEV_OPS
+ /* Netdevice_ops API compatiability support.
+ * This is temporary until all network devices are converted.
+ */
+ if (dev->netdev_ops) {
+ const struct net_device_ops *ops = dev->netdev_ops;
+
+ dev->init = ops->ndo_init;
+ dev->uninit = ops->ndo_uninit;
+ dev->open = ops->ndo_open;
+ dev->change_rx_flags = ops->ndo_change_rx_flags;
+ dev->set_rx_mode = ops->ndo_set_rx_mode;
+ dev->set_multicast_list = ops->ndo_set_multicast_list;
+ dev->set_mac_address = ops->ndo_set_mac_address;
+ dev->validate_addr = ops->ndo_validate_addr;
+ dev->do_ioctl = ops->ndo_do_ioctl;
+ dev->set_config = ops->ndo_set_config;
+ dev->change_mtu = ops->ndo_change_mtu;
+ dev->tx_timeout = ops->ndo_tx_timeout;
+ dev->get_stats = ops->ndo_get_stats;
+ dev->vlan_rx_register = ops->ndo_vlan_rx_register;
+ dev->vlan_rx_add_vid = ops->ndo_vlan_rx_add_vid;
+ dev->vlan_rx_kill_vid = ops->ndo_vlan_rx_kill_vid;
+#ifdef CONFIG_NET_POLL_CONTROLLER
+ dev->poll_controller = ops->ndo_poll_controller;
+#endif
+ } else {
+ char drivername[64];
+ pr_info("%s (%s): not using net_device_ops yet\n",
+ dev->name, netdev_drivername(dev, drivername, 64));
+
+ /* This works only because net_device_ops and the
+ compatiablity structure are the same. */
+ dev->netdev_ops = (void *) &(dev->init);
+ }
+#endif
+
/* Init, if this function is available */
- if (dev->init) {
- ret = dev->init(dev);
+ if (dev->netdev_ops->ndo_init) {
+ ret = dev->netdev_ops->ndo_init(dev);
if (ret) {
if (ret > 0)
ret = -EIO;
@@ -4086,8 +4131,8 @@
return ret;
err_uninit:
- if (dev->uninit)
- dev->uninit(dev);
+ if (dev->netdev_ops->ndo_uninit)
+ dev->netdev_ops->ndo_uninit(dev);
goto out;
}